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Full text of "Alaskan glacier studies of the National Geographic Society in the Yakutat Bay, Prince William Sound and lower Copper River regions"

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In July, 1905, Shoup Glacier was visited by Grant whose descriptions, photographs, and maps l indicate that two large rocks were then being exposed by the retreat of the glacier that were not visible four years before. Along the sides of the glacier there was a broad space of bare ground free from soil and vegetation, and the whole aspect of the glacier indicated that it was retreating. On July IS, 1908, Grant and Higgins found that the front was in practically the same position as on July 4, 1905, as was also the case on June 16,1909.
The statement by Grant that the two large rocks not visible in 1901 were being ex-
posed in 1905, is of interest in view of the fact that in 1898, these ledges were already exposed, as shown by Schrader's photograph. Nearly five times as much of the larger rock showed hi 1905 as in 1898. In 1908 the two areas of exposed rock ledges were nearly connected, the smaller or westernmost being of about the same size as in 1898 and 1905 while the larger, east, rock ledge was a little longer and higher in 1908 than in 1905. The progressive enlargement of the rock ledge areas between 1901 and 1905, and from 1905 to 1908, seems to indicate slow, though uninterrupted retreat during these years; but the fact that no ledges were visible in 1901, while two ledges were visible in 1898 and 1905 suggests a slight advance of Shoup Glacier between 1898 and 1901. Further evi-
i In H. F. Reid's Variations of Glaciers, Journ. Geol., Vol. XIV, 1900, p. 408; Vol. XVH, 1909, p. 670. Grant, U. S. and ffiggins D. F., Glaciers of the Northern Part of Prince William Sound, Bull. Amer. Geog. Soc., Vol. XLH, 1910, pp. 72W27.